Efficient remediation of mercury-contaminated groundwater using MoS2 nanosheets in an in situ reactive zone

Wang，Mengxia1,2; Han，Qi2; Zhang，Meng2; Liu，Xun1,2; Liu，Bei2; Wang，Zhongying2,3

2024-05-01

10.1016/j.jconhyd.2024.104347

Journal of Contaminant Hydrology   影响因子和分区

0169-7722

1873-6009

Mercury contamination in groundwater is a serious global environmental issue that poses threats to human and environmental health. While MoS nanosheets have been proven promising in removing Hg from groundwater, an effective tool for in situ groundwater remediation is still needed. In this study, we investigated the transport and retention behavior of MoS nanosheets in sand column, and employed the formed MoS in situ reactive zone (IRZ) for the remediation of Hg-contaminated groundwater. Breakthrough test revealed that high flow velocity and MoS initial concentration promoted the transport of MoS in sand column, while the addition of Ca ions increased the retention of MoS. In Hg removal experiments, the groundwater flow velocity did not influence the Hg removal capacity due to the fast reaction rate between MoS and Hg. With an optimized MoS loading, MoS IRZ effectively reduced the Hg effluent concentration down to <1 μg/L without apparent Hg remobilization. Additionally, flake-like MoS employed in this study showed much better Hg removal performance than flower-like and bulk MoS, as well as other reported materials, with the Hg removal capacity a few to tens of times higher than those materials. These results suggest that MoS nanosheets have the potential to be an efficient IRZ reactive material for in situ remediation of Hg in contaminated groundwater.

Groundwater In situ reactive zone MoS2 nanosheets Remediation

SCI ; EI

英语

通讯

ENVIRONMENT/ECOLOGY

2-s2.0-85190835794

Scopus

1.School of Environment,Harbin Institute of Technology,China
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Mengxia,Han，Qi,Zhang，Meng,et al. Efficient remediation of mercury-contaminated groundwater using MoS2 nanosheets in an in situ reactive zone[J]. Journal of Contaminant Hydrology,2024,264.

Wang，Mengxia,Han，Qi,Zhang，Meng,Liu，Xun,Liu，Bei,&Wang，Zhongying.(2024).Efficient remediation of mercury-contaminated groundwater using MoS2 nanosheets in an in situ reactive zone.Journal of Contaminant Hydrology,264.

Wang，Mengxia,et al."Efficient remediation of mercury-contaminated groundwater using MoS2 nanosheets in an in situ reactive zone".Journal of Contaminant Hydrology 264(2024).